Multi Function Digital Display Voltage Tester Voltage Test Pen Pencil AC DC Detector with LED Features: 2. Check the wires with a variety of appliances through the circuit, to distinguish the zero-phase line to find the breakpoint.  3. Made of first quality material, it is strong and durable e.  5. ABS plastic handle, resistant to falling, aging and safety insulation. 6. With LED lighting function, more convenient e. Specification: Condition: Function: LED Lighting Color: Yellow & Black Package List: Key Description: DIRECT Means: direct detection button Automatic Detection Function: Usage: Self-test before use, hold the electric pen head in one hand and press the direct detection button in the other hand. Phenomenon: The light is on, indicating that the test pencil battery is sufficient, and the light is off, indicating that it needs to be replaced. FireWire Detection Function: Usage: Press the direct test button of the test pencil in one hand and put the batch head into the fire line. Zero Line Detection Function: Usage: Press the direct test button of the test pencil in one hand and put the batch head into the zero line. Phenomenon: The blue screen light is on, and the screen displays 12V (the value is displayed or not displayed when there is an external electric field, only the light is on). Breakpoint Detection Function: Usage: Press the breakpoint detection button, the cutter head is close to the wire, a lightning bolt appears, and the bit is moved along the wire. Phenomenon: If the lightning symbol disappears, the performance here is the breaking point of the wire. Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.